Rotary kiln circulating oxygen control system and method and computer readable storage medium

Abstract

The invention relates to a rotary kiln circulation oxygen control system and method and a computer readable storage medium, and belongs to the technical field of activated carbon regeneration. The rotary kiln circulation oxygen control system comprises a gas supply module, an oxygen content monitoring module, a tail gas monitoring module, an automatic control module and a tail gas return module; the gas supply module is used for providing combustion air and natural gas into the rotary kiln body; the oxygen content monitoring module is used for monitoring the oxygen content in the kiln head or the kiln body in real time and generating monitoring data in the kiln; the tail gas monitoring module is used for monitoring the tail gas temperature and the tail gas oxygen content at a tail gas outlet of the kiln tail in real time and generating tail gas monitoring data. The automatic control module is used for generating a tail gas return instruction according to the in-kiln monitoring data and the tail gas monitoring data; and the tail gas returning module is used for responding to the tail gas returning instruction and returning the tail gas at the tail gas outlet to the kiln head or the kiln body. According to the method, dynamic balance and accurate control of the oxygen content of different sections in the rotary kiln can be achieved.

Description

Technical Field

[0001] The present application relates to the technical field of activated carbon regeneration, and in particular to a rotary kiln circulating oxygen control system, method and computer-readable storage medium. Background Art

[0002] The rotary kiln is a high-temperature heat treatment equipment widely used in industrial production, mainly used in cement clinker calcination, metallurgical ore roasting, activated carbon regeneration, waste treatment and other processes. In the actual application of the rotary kiln, the temperature control, oxygen content regulation and heat utilization efficiency in the kiln are the key factors affecting production efficiency and product quality. Especially in the field of activated carbon regeneration, the rotary kiln desorbs the adsorbent on the surface of the waste activated carbon through high-temperature pyrolysis, thereby restoring the adsorption performance of the activated carbon.

[0003] In the activated carbon regeneration process, the oxygen content control process in the rotary kiln is crucial. The high-temperature desorption reaction of activated carbon requires that the oxygen content be controlled within a certain range: too high an oxygen content can easily cause the activated carbon to undergo a combustion reaction and turn into carbon dioxide, reducing the activated carbon regeneration efficiency; too low an oxygen content can lead to incomplete combustion and fail to maintain the required high-temperature environment. However, due to the complex structure of the rotary kiln, there are differences in oxygen content in different sections. If the oxygen distribution is uneven, it is easy to cause oxygen content deviations in local areas, affecting the regeneration efficiency and combustion stability. Summary of the invention

[0004] In order to achieve dynamic balance and precise control of oxygen content in different sections of a rotary kiln, the present application provides a rotary kiln circulating oxygen control system, method and computer-readable storage medium.

[0005] In the first aspect, the present application provides a rotary kiln circulating oxygen control system, which adopts the following technical solution: A rotary kiln circulating oxygen control system is applied to a rotary kiln body including a kiln head, a kiln body and a kiln tail, and the rotary kiln circulating oxygen control system includes an air supply module, an oxygen content monitoring module, an exhaust gas monitoring module, an automatic control module and an exhaust gas return module; The air supply module is used to provide combustion-supporting air and natural gas into the rotary kiln body; The oxygen content monitoring module is used to monitor the oxygen content in the kiln head or the kiln body in real time and generate kiln monitoring data; The tail gas monitoring module is used to monitor the tail gas temperature and tail gas oxygen content at the tail gas outlet of the kiln in real time and generate tail gas monitoring data; The automatic control module is connected to the oxygen content monitoring module and the tail gas monitoring module respectively, and is used to generate tail gas return instructions according to the kiln monitoring data and tail gas monitoring data; The tail gas return module is used to respond to the tail gas return instruction to return the tail gas at the tail gas outlet to the kiln head or the kiln body.

[0006] By adopting the above technical scheme, the temperature and oxygen content of the exhaust gas are monitored and analyzed in real time, and the high-temperature and low-oxygen exhaust gas is returned to the kiln head or kiln body of the rotary kiln to achieve heat recycling and dynamic compensation. By accurately controlling the oxygen content, the dynamic balance of the oxygen content in the rotary kiln is maintained, thereby improving the regeneration efficiency of the activated carbon, reducing the natural gas consumption, and achieving a high-efficiency, environmentally friendly, and energy-saving technical effect.

[0007] Optionally, the automatic control module includes a deviation calculation unit, a data processing unit, an exhaust gas temperature judgment unit and a control unit; The deviation calculation unit is used to analyze the monitoring data in the kiln and calculate the current oxygen content deviation of the kiln head or the kiln body based on the preset oxygen content; The data processing unit is used to determine the tail gas return flow rate and the target tail gas return point according to the current oxygen content deviation of the kiln head or the kiln body; wherein the tail gas return point is respectively arranged on the kiln head or the kiln body; The exhaust gas temperature judgment unit is used to receive the exhaust gas monitoring data and judge whether the exhaust gas temperature exceeds a preset temperature threshold, and if so, output a temperature appropriateness signal; The control unit is used to generate an exhaust gas return instruction in response to the temperature suitability signal and according to the exhaust gas return flow rate and the target exhaust gas return point, and send the instruction to the exhaust gas return module.

[0008] By adopting the above technical solution, the oxygen supply and exhaust gas return are dynamically adjusted, and the exhaust gas is dynamically returned to the appropriate position to ensure that the oxygen content in the rotary kiln is always maintained at an optimal level. In this way, the oxygen content balance in the rotary kiln is maintained, and the regeneration efficiency of activated carbon is effectively improved.

[0009] Optionally, the preset oxygen content includes a first preset oxygen content at the kiln head, a second preset oxygen content at the kiln body, and a third preset oxygen content at the kiln tail, and the current oxygen content deviation includes a first oxygen content deviation at the kiln head, a second oxygen content deviation at the kiln body, and a third oxygen content deviation at the kiln tail.

[0010] Optionally, the exhaust gas return module includes a multi-point gas guide network and a return regulation unit; The multi-point gas guide network includes gas guide pipes respectively arranged at the tail gas return points and connected to the tail gas outlet of the kiln tail, and is used to respond to the tail gas return instruction and return the tail gas to the kiln head or kiln body according to the target tail gas return point; The return regulating unit is arranged on the air duct, and is used for regulating the exhaust gas return flow rate of the air duct in response to the exhaust gas return instruction.

[0011] By adopting the above technical solution, the return flow rate is accurately adjusted to ensure that the exhaust gas is quantitatively distributed to the target points according to demand. Combined with the multi-point gas guide network, dual precise control of the exhaust gas flow rate and the return point is achieved to meet the oxygen content and heat requirements of each kiln section, reducing the problems of unstable oxygen content regulation and heat waste in traditional rotary kilns, and improving the overall energy efficiency and stability of the rotary kiln system. The above technical solution has significant industrial application value and innovative advantages.

[0012] Optionally, the data processing unit is further used to calculate the air supply adjustment amount according to the current oxygen content deviation, and the control unit is further used to generate an air supply adjustment instruction according to the air supply adjustment amount and send it to the air supply module.

[0013] By adopting the above technical solution, the gas supply demand is calculated in real time, and the gas supply is dynamically adjusted according to the oxygen content deviation to ensure that the oxygen content smoothly returns to the target value. This realizes dynamic adjustment and control of the gas supply and ensures combustion stability.

[0014] Optionally, the gas supply module includes a gas supply delivery device and a proportional regulating valve; The air supply and delivery device is connected to the air inlet of the kiln head and is used to respond to the air supply adjustment instruction and adjust the combustion-supporting air and natural gas delivered to the rotary kiln according to the air supply adjustment amount; The ratio regulating valve is arranged on the gas supply and delivery device and is used to adjust the supply ratio of combustion-supporting air and natural gas.

[0015] By adopting the above technical solution, the gas supply adjustment amount is dynamically calculated according to the oxygen content deviation, and the oxygen content in the rotary kiln is dynamically and accurately controlled, making the combustion process more stable, and the thermal energy utilization rate of the exhaust gas is significantly improved, achieving the technical goals of efficient energy saving and intelligent control.

[0016] In a second aspect, the present application provides a rotary kiln circulating oxygen control method, which adopts the following technical solution: A rotary kiln circulating oxygen control method is applied to a rotary kiln body including a kiln head, a kiln body and a kiln tail, and the circulating oxygen control method comprises: Real-time monitoring of the oxygen content in the kiln head or the kiln body to generate kiln monitoring data; Real-time monitoring of the tail gas temperature and tail gas oxygen content at the tail gas outlet of the kiln tail to generate tail gas monitoring data; Generate an exhaust gas return instruction according to the kiln monitoring data and the exhaust gas monitoring data; According to the tail gas return instruction, the tail gas at the tail gas outlet is returned to the kiln head or the kiln body.

[0017] Optionally, the step of generating an exhaust gas return instruction according to the kiln monitoring data and the exhaust gas monitoring data includes: Analyzing the monitoring data in the kiln, and calculating the current oxygen content deviation of the kiln head or the kiln body based on the preset oxygen content; Determine the tail gas return flow rate and target tail gas return point according to the current oxygen content deviation of the kiln head or the kiln body; wherein the tail gas return point is respectively arranged on the kiln head or the kiln body; Determining whether the exhaust gas temperature exceeds a preset temperature threshold; If so, a tail gas return instruction is generated according to the tail gas return flow rate and the target tail gas return point; wherein the tail gas return instruction is used to return the tail gas to the kiln head or kiln body according to the target tail gas return point.

[0018] Optionally, after the step of respectively calculating the current oxygen content deviation of the kiln head or the kiln body based on the preset oxygen content, the method further includes: Calculating the air supply adjustment amount according to the current oxygen content deviation; A gas supply regulating instruction is generated according to the gas supply regulating amount, and the gas supply regulating instruction is used to regulate the combustion-supporting air and natural gas delivered to the rotary kiln according to the gas supply regulating amount.

[0019] In a third aspect, the present application provides a computer-readable storage medium, which adopts the following technical solution: A computer-readable storage medium stores a computer program that can be loaded by a processor and execute any one of the methods in the first aspect.

[0020] In summary, the present application includes at least one of the following beneficial technical effects: improving energy utilization, reducing fuel consumption, ensuring that the process conditions in each section of the rotary kiln meet the requirements of efficient desorption of activated carbon, and reducing exhaust emissions, achieving energy conservation, environmental protection, and process stability, significantly improving the quality of regenerated products and the overall operating efficiency of the system, and having important economic benefits and practical industrial application value. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a rotary kiln body and a rotary kiln circulating oxygen control system in one embodiment of the present application.

[0022] Figure 2 It is a schematic cross-sectional view of a rotary kiln with tail gas recycling points marked in one of the embodiments of the present application.

[0023] Figure 3 It is a schematic flow chart of a rotary kiln circulating oxygen control method according to one of the embodiments of the present application.

[0024] Figure 4 It is a schematic flow chart of a rotary kiln circulating oxygen control method according to another embodiment of the present application.

[0025] Figure 5 It is a schematic flow chart of a rotary kiln circulation oxygen control method according to another embodiment of the present application.

[0026] Explanation of the reference numerals: 11, kiln head; 12, kiln body; 13, kiln tail; 2, air guide pipe; 21, return regulating valve. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solutions and advantages of this application more clear, the following Figure 1-5 It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0028] At present, rotary kilns are widely used in cement production, activated carbon regeneration, metallurgical ore roasting and other industrial fields as high-temperature heat treatment equipment. In the activated carbon regeneration process, the oxygen content and temperature control in the rotary kiln play a decisive role in the regeneration efficiency and product quality. However, there are two key problems in traditional rotary kiln systems: the exhaust gas heat energy is not fully recycled, resulting in energy waste; the oxygen content control is not accurate, which easily leads to incomplete combustion or carbonization, affecting the regeneration effect of activated carbon. Therefore, how to achieve efficient heat energy utilization through exhaust gas return and dynamically adjust the oxygen content is a problem that needs to be solved urgently.

[0029] The embodiment of the present application discloses a rotary kiln circulating oxygen control system.

[0030] Reference Figure 1 A rotary kiln circulating oxygen control system is applied to a rotary kiln body including a kiln head 11, a kiln body 12 and a kiln tail 13. The rotary kiln circulating oxygen control system includes an air supply module, an oxygen content monitoring module, an exhaust gas monitoring module, an automatic control module and an exhaust gas return module.

[0031] Air supply module, used to provide combustion air and natural gas to the rotary kiln body; The gas supply module includes a natural gas supply system and a combustion-supporting air supply system, which are used to provide the rotary kiln with the fuel and oxidant required for combustion. The module ensures the stability of the combustion temperature of the kiln head 11 and meets the oxygen requirements of different kiln sections. For example, the gas supply module supplies natural gas to the kiln head 11, mixes it with the combustion-supporting air, and maintains the temperature of the kiln head 11 at 100-150°C. At the same time, according to the oxygen content requirement of the kiln head 11, the air flow rate is automatically adjusted to ensure sufficient combustion and stable oxygen content.

[0032] An oxygen content monitoring module is used to monitor the oxygen content in the kiln head 11 or the kiln body 12 in real time and generate kiln monitoring data; Among them, oxygen content sensors can be arranged at the kiln head 11 or the kiln body 12 to obtain oxygen content data of each section in real time, generate monitoring data in the kiln, and transmit it to the automatic control module. For example, the oxygen content sensor at the kiln head 11 detects that the current oxygen content is 4.2% (higher than the preset oxygen content of 4%), indicating excessive combustion, and it is necessary to reduce the supply of combustion-supporting air or appropriately adjust the exhaust gas return flow rate; the oxygen content sensor at the kiln body 12 shows 2.5% (lower than the preset oxygen content of 3%), indicating that there is insufficient oxygen, and exhaust gas with a suitable oxygen content needs to be returned for supplementation.

[0033] The tail gas monitoring module is used to monitor the tail gas temperature and tail gas oxygen content at the tail gas outlet of the kiln tail 13 in real time and generate tail gas monitoring data; Among them, the temperature and oxygen content of the tail gas outlet at the kiln tail 13 can be monitored by a temperature sensor and an oxygen content sensor to evaluate whether the tail gas is suitable for recycling. For example, the temperature at the tail gas outlet is 750°C (higher than the threshold of 500°C), indicating that the tail gas has a calorific value and can be recycled to the kiln body 12 for heat compensation; the current tail gas oxygen content is 1.2%, indicating that the oxygen content is low and can be used to replenish the low oxygen area in the kiln (such as the kiln body 12).

[0034] The automatic control module is connected to the oxygen content monitoring module and the tail gas monitoring module respectively, and is used to generate tail gas return instructions according to the kiln monitoring data and the tail gas monitoring data; Among them, the automatic control module can dynamically calculate the current oxygen content deviation of different kiln sections based on the kiln monitoring data and exhaust gas monitoring data, and determine the priority return point based on the oxygen content deviation, and at the same time determine the exhaust gas return flow rate.

[0035] An exhaust gas return module is used to return the exhaust gas at the exhaust gas outlet to the kiln head 11 or the kiln body 12 in response to the exhaust gas return instruction; Among them, the exhaust gas can be returned by adjusting the valve to transport the exhaust gas to the designated point (kiln head 11 or kiln body 12) and control it according to the set flow rate to ensure that the high-temperature exhaust gas enters the rotary kiln to supplement the oxygen content and provide heat.

[0036] It is understandable that, in combination with the actual needs of different process sections, the tail gas is dynamically returned to a suitable location to maintain the oxygen content balance in the rotary kiln; in some embodiments, the optimal oxygen content in the rotary kiln can be controlled to 3%.

[0037] In the above-mentioned implementation mode, the temperature and oxygen content of the exhaust gas are monitored and analyzed in real time, and the high-temperature low-oxygen exhaust gas is returned to the kiln head 11 or the kiln body 12 of the rotary kiln to realize the recycling and dynamic compensation of heat. By precisely controlling the oxygen content, the dynamic balance of the oxygen content in the rotary kiln is maintained, thereby improving the regeneration efficiency of the activated carbon, reducing the natural gas consumption, and achieving the technical effect of high efficiency, environmental protection, and energy saving.

[0038] As an implementation mode of the automatic control module, the automatic control module includes a deviation calculation unit, a data processing unit, an exhaust gas temperature judgment unit and a control unit; The deviation calculation unit is used to analyze the monitoring data in the kiln and calculate the current oxygen content deviation of the kiln head 11 or the kiln body 12 based on the preset oxygen content; Specifically, the current oxygen content of the kiln head 11 or the kiln body 12 is compared with a preset oxygen content target value, and the oxygen content deviation of each segment is calculated respectively; Among them, the oxygen content deviation calculation formula is: ΔO2=Otarget−Ocurrent; In the above formula, Otarget is the preset oxygen content of each section, and Ocurrent is the current oxygen content of the kiln head 11, the kiln body 12, and the kiln tail 13 respectively.

[0039] In an embodiment of the present application, the preset oxygen content includes a first preset oxygen content at the kiln head 11, a second preset oxygen content at the kiln body 12, and a third preset oxygen content at the kiln tail 13, and the current oxygen content deviation includes a first oxygen content deviation at the kiln head 11, a second oxygen content deviation at the kiln body 12, and a third oxygen content deviation at the kiln tail 13.

[0040] A data processing unit is used to determine the tail gas return flow rate and the target tail gas return point according to the current oxygen content deviation of the kiln head 11 or the kiln body 12; wherein the tail gas return point is arranged on the kiln head 11 or the kiln body 12 respectively; Specifically, based on the deviation calculation results and combined with the oxygen content requirements of each kiln section, the tail gas return flow rate and target tail gas return point are determined. When the oxygen content is insufficient, the kiln section with the largest oxygen content deviation can be preferentially selected as the target point for tail gas return. The larger the deviation value, the greater the tail gas return flow rate.

[0041] In some embodiments, according to the operating conditions of the rotary kiln and the process requirements of each section, the exhaust gas can be flexibly returned to different locations: the kiln head 11 is preferentially used to supplement the combustion heat and maintain the combustion temperature of the kiln head 11; the kiln body 12 is mainly used to supplement the heat to ensure the continuation of the high-temperature desorption reaction; when necessary, it is returned to the kiln tail section 13 to maintain the heat balance of the overall system and avoid local insufficient temperature.

[0042] An exhaust gas temperature judgment unit is used to receive exhaust gas monitoring data and judge whether the exhaust gas temperature exceeds a preset temperature threshold, and if so, output a temperature appropriateness signal; Specifically, by presetting the temperature threshold to ensure the applicability of exhaust gas recycling, only high-temperature exhaust gas is recycled to ensure the recycling heat value, avoid low-temperature exhaust gas recycling, and prevent insufficient system heat compensation.

[0043] The control unit is used to respond to the temperature suitability signal, generate an exhaust gas return instruction according to the exhaust gas return flow rate and the target exhaust gas return point, and send it to the exhaust gas return module.

[0044] The target return points are distributed at the kiln head 11 or the kiln body 12, and the return flow rate can be allocated according to the dynamically calculated ratio. For example, the return points include point a on the kiln head 11 and point b on the kiln body 12, where the kiln head 11 returns 60% of the flow rate and the kiln body 12 returns 40% of the flow rate.

[0045] In the above embodiment, the oxygen supply and tail gas return are dynamically adjusted, and the tail gas is dynamically returned to a suitable position to ensure that the oxygen content in the rotary kiln is always maintained at an optimal level, so as to maintain the oxygen content balance in the rotary kiln and effectively improve the regeneration efficiency of the activated carbon.

[0046] As an implementation method of the exhaust gas return module, the exhaust gas return module includes a multi-point gas guide network and a return regulation unit; A multi-point gas guide network, comprising gas guide pipes 2 respectively arranged at tail gas return points and connected to the tail gas outlet of the kiln tail 13, for responding to the tail gas return instruction and returning the tail gas to the kiln head 11 or the kiln body 12 according to the target tail gas return point; Among them, each air guide pipe 2 corresponds to an exhaust gas return point, ensuring that the exhaust gas can be directed back to the target location. According to the exhaust gas return instruction generated by the automatic control module, the multi-point air guide network transports the exhaust gas to designated areas such as the kiln head 11 or the kiln body 12.

[0047] In the embodiment of the present application, the multi-point gas guide network is an exhaust gas delivery system including multiple air guide pipe 2 arrangement points. By rationally arranging the air guide pipe 2, it is ensured that the exhaust gas can be directed to the designated target position according to different needs, thereby achieving the purpose of exhaust gas flow control, uniform distribution and efficient delivery.

[0048] Reference Figure 1 , Figure 2The tail gas recycling points in the rotary kiln have various feasibility according to the actual process requirements and structural design. For example, recycling points can be set on different sections of the rotary kiln body 12 (such as setting point a on the kiln head 11, and setting points b and c on the kiln body 12) to supplement the heat and oxygen required by each section; at the same time, multiple recycling points (such as points d, e, f, and g) can be set on the same section of the rotary kiln, among which points d and e on both sides of the bottom are the best. The recycled tail gas enters from the bottom, which is convenient for the high-temperature tail gas to directly contact with the waste activated carbon, improve the heat conduction effect, and realize the efficient desorption reaction.

[0049] The return regulating unit is arranged on the air duct 2 and is used for regulating the exhaust gas return flow rate of the air duct 2 in response to the exhaust gas return instruction.

[0050] The return regulating unit may be a return regulating valve 2121, which is arranged on each air duct 2, and is used to dynamically adjust the tail gas return flow rate according to the tail gas return instruction of the automatic control module, and control the flow rate ratio of the tail gas return according to the oxygen content deviation and heat demand of each target tail gas return point. Specifically, when the oxygen content of a kiln section is low or the heat demand is high, the return regulating unit automatically opens or increases the flow rate; when the oxygen content reaches a balance, the flow rate is reduced or the return is closed.

[0051] It is understandable that when the oxygen content and heat in the kiln are compensated, the monitoring data is fed back to the automatic control module, and the system continuously adjusts the feedback strategy to ensure the dynamic balance of oxygen content and efficient use of heat energy.

[0052] In the above implementation mode, the return flow rate is precisely adjusted to ensure that the exhaust gas is quantitatively distributed to the target points as required. Combined with the multi-point gas guide network, dual precise control of the exhaust gas flow rate and the return point is achieved to meet the oxygen content and heat requirements of each kiln section, reducing the problems of unstable oxygen content regulation and heat waste in traditional rotary kilns, and improving the overall energy efficiency and stability of the rotary kiln system. The above technical solution has significant industrial application value and innovative advantages.

[0053] As a further implementation of the data processing unit and the control unit, the data processing unit is further used to calculate the air supply adjustment amount according to the current oxygen content deviation, and the control unit is further used to generate an air supply adjustment instruction according to the air supply adjustment amount and send it to the air supply module.

[0054] The calculation formula for the gas supply adjustment amount is: Qadjust=K×ΔO2; Qadjust is the gas supply adjustment amount, which indicates the increase or decrease in the gas supply; ΔO2 is the current oxygen content deviation; K is the gas supply adjustment coefficient, which is set according to process requirements.

[0055] Specifically, if the oxygen content is low (the deviation is positive), the supply of combustion-supporting air or natural gas is increased; if the oxygen content is high (the deviation is negative), the supply of combustion-supporting air or natural gas is reduced.

[0056] In the above implementation, the gas supply demand is calculated in real time, and the gas supply is dynamically adjusted according to the oxygen content deviation to ensure that the oxygen content returns to the target value smoothly, thereby realizing dynamic regulation and control of the gas supply and ensuring combustion stability.

[0057] As an implementation mode of the air supply module, the air supply module includes an air supply conveying device and a proportional regulating valve; The air supply and delivery device is connected to the air inlet of the kiln head 11 and is used to respond to the air supply adjustment instruction and adjust the combustion-supporting air and natural gas delivered to the rotary kiln according to the air supply adjustment amount; The proportional control valve is arranged on the gas supply and delivery device to adjust the supply ratio of combustion air and natural gas.

[0058] Specifically, when gas supply adjustment is required, the gas supply conveying device conveys combustion air and natural gas to the air inlet of the kiln head 11, and the proportion regulating valve adjusts the natural gas flow rate accordingly to ensure that the gas supply ratio is appropriate, so as to provide stable combustion air and natural gas, maintain the combustion temperature, and ensure the dynamic balance of oxygen content in the kiln.

[0059] In the above implementation, the gas supply adjustment amount is dynamically calculated according to the oxygen content deviation, and the oxygen content in the rotary kiln is dynamically and accurately controlled, so that the combustion process is more stable, the thermal energy utilization rate of the exhaust gas is significantly improved, and the technical goals of high efficiency, energy saving and intelligent control are achieved.

[0060] Based on the above technical solution, in the actual application process of the present application, the temperature of the kiln head 11 of the rotary kiln can be maintained at 100~150℃, the oxygen content can be controlled at 4%, and an air supply module can be equipped to ensure that the natural gas and the combustion-supporting air are fully burned, and the high-temperature heat source required in the rotary kiln is provided. The heat generated by the combustion gradually increases the temperature in the rotary kiln to 700~800℃. Under this high temperature condition, the organic matter adsorbed on the surface of the waste activated carbon is fully desorbed and desorbed, so that the iodine value of the activated carbon is significantly improved, and the adsorption performance recovery rate can reach about 80%. At this time, the temperature of the gas discharged from the kiln tail 13 is about 750℃, and the oxygen content is reduced to 1~2%. The tail gas has the characteristics of high temperature and low oxygen. In order to realize the recycling of heat energy, the tail gas is returned to the kiln head 11 or the kiln body 12 of the rotary kiln through the air guide pipe 2, and its high temperature calorific value is used to supplement the heat. At the same time, the oxygen concentration of the kiln head 11 is adjusted by the air supply module to ensure stable combustion and maintain the high-temperature reaction environment in the kiln, thereby reducing natural gas consumption and energy waste, so as to ensure the efficient and stable operation of the activated carbon regeneration process.

[0061] The embodiment of the present application also discloses a rotary kiln circulation oxygen control method.

[0062] Reference Figure 3 A rotary kiln circulating oxygen control method is applied to a rotary kiln body including a kiln head, a kiln body and a kiln tail. The circulating oxygen control method includes: Step S101, real-time monitoring of the oxygen content in the kiln head or the kiln body to generate kiln monitoring data; Step S102, real-time monitoring of the tail gas temperature and tail gas oxygen content at the tail gas outlet of the kiln tail, generating tail gas monitoring data; Step S103, generating an exhaust gas return instruction according to the kiln monitoring data and the exhaust gas monitoring data; Step S104, according to the tail gas return instruction, the tail gas at the tail gas outlet is returned to the kiln head or the kiln body.

[0063] In the above-mentioned implementation mode, by real-time monitoring of the oxygen content in the kiln head or the kiln body and the temperature and oxygen content of the exhaust gas outlet at the kiln tail, the kiln monitoring data and the exhaust gas monitoring data are generated, the current system status is automatically analyzed and the exhaust gas return instruction is generated, and the high-temperature, low-oxygen exhaust gas is dynamically returned to the kiln head or the kiln body to supplement heat and adjust the oxygen content, so as to maintain the thermal energy balance of the system and the dynamic stability of the oxygen content.

[0064] Reference Figure 4 As an implementation method of step S103, the step of generating an exhaust gas return instruction according to the kiln monitoring data and the exhaust gas monitoring data includes: Step S201, analyzing the monitoring data in the kiln, and calculating the current oxygen content deviation of the kiln head or the kiln body based on the preset oxygen content; Step S202, determining the tail gas return flow rate and the target tail gas return point according to the current oxygen content deviation of the kiln head or the kiln body; wherein the tail gas return point is arranged on the kiln head or the kiln body respectively; Step S203, determine whether the exhaust gas temperature exceeds a preset temperature threshold; if so, jump to step S204; if not, delay the preset time and re-execute step S203.

[0065] Step S204, generating a tail gas return instruction according to the tail gas return flow rate and the target tail gas return point; wherein the tail gas return instruction is used to return the tail gas to the kiln head or the kiln body according to the target tail gas return point.

[0066] In the above embodiment, the oxygen supply and tail gas return are dynamically adjusted, and the tail gas is dynamically returned to a suitable position to ensure that the oxygen content in the rotary kiln is always maintained at an optimal level, so as to maintain the oxygen content balance in the rotary kiln and effectively improve the regeneration efficiency of the activated carbon.

[0067] Reference Figure 5 As a further implementation of the cyclic oxygen control method, after the step of calculating the current oxygen content deviation of the kiln head or the kiln body based on the preset oxygen content, the method further includes: Step S301, calculating the air supply adjustment amount according to the current oxygen content deviation; Step S302, generating a gas supply adjustment instruction according to the gas supply adjustment amount, the gas supply adjustment instruction is used to adjust the combustion-supporting air and natural gas delivered to the rotary kiln according to the gas supply adjustment amount.

[0068] In the above implementation, the gas supply demand is calculated in real time, and the gas supply is dynamically adjusted according to the oxygen content deviation to ensure that the oxygen content returns to the target value smoothly, thereby realizing dynamic regulation and control of the gas supply and ensuring combustion stability.

[0069] A rotary kiln circulating oxygen control system in an embodiment of the present application can implement any of the above-mentioned rotary kiln circulating oxygen control methods, and the specific working process of each step in the rotary kiln circulating oxygen control method can refer to the corresponding process in the above-mentioned system embodiment.

[0070] In the several embodiments provided in this application, it should be understood that the provided methods and systems can be implemented in other ways. For example, the system embodiments described above are only illustrative; for example, the division of a certain module is only a logical function division, and there may be other division methods in actual implementation, such as multiple modules can be combined or integrated into another system, or some features can be ignored or not executed.

[0071] The embodiment of the present application also discloses a computer-readable storage medium.

[0072] A computer-readable storage medium stores a computer program that can be loaded by a processor and execute any one of the above-mentioned methods for controlling oxygen circulation in a rotary kiln.

[0073] Among them, computer-readable storage media can be any tangible medium that contains or stores a program, which can be used by or in conjunction with an instruction execution system, apparatus or device; the program code contained on the computer-readable medium can be transmitted using any appropriate medium, including but not limited to wireless, wire, optical cable, RF, etc., or any suitable combination of the above.

[0074] It should be noted that in the above embodiments, the description of each embodiment has different emphases, and for the parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0075] The above are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. Any feature disclosed in this specification (including the abstract and drawings), unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

Claims

1. A rotary kiln circulating oxygen control system, applied to a rotary kiln body comprising a kiln head (11), a kiln body (12) and a kiln tail (13), characterized in that: The rotary kiln circulating oxygen control system includes an air supply module, an oxygen content monitoring module, an exhaust gas monitoring module, an automatic control module and an exhaust gas return module; The air supply module is used to provide combustion-supporting air and natural gas into the rotary kiln body; The oxygen content monitoring module is used to monitor the oxygen content in the kiln head (11) or the kiln body (12) in real time and generate kiln monitoring data; The exhaust gas monitoring module is used to monitor the exhaust gas temperature and exhaust gas oxygen content at the exhaust gas outlet of the kiln tail (13) in real time to generate exhaust gas monitoring data; The automatic control module is connected to the oxygen content monitoring module and the tail gas monitoring module respectively, and is used to generate tail gas return instructions according to the kiln monitoring data and tail gas monitoring data; The exhaust gas return module is used to return the exhaust gas at the exhaust gas outlet to the kiln head (11) or the kiln body (12) in response to the exhaust gas return instruction.

2. A rotary kiln circulating oxygen control system according to claim 1, characterized in that: The automatic control module includes a deviation calculation unit, a data processing unit, an exhaust gas temperature judgment unit and a control unit; The deviation calculation unit is used to analyze the monitoring data in the kiln and calculate the current oxygen content deviation of the kiln head (11) or the kiln body (12) based on the preset oxygen content; The data processing unit is used to determine the exhaust gas return flow rate and the target exhaust gas return point according to the current oxygen content deviation of the kiln head (11) or the kiln body (12); wherein the exhaust gas return point is arranged on the kiln head (11) or the kiln body (12) respectively; The exhaust gas temperature judgment unit is used to receive the exhaust gas monitoring data and judge whether the exhaust gas temperature exceeds a preset temperature threshold, and if so, output a temperature appropriateness signal; The control unit is used to generate an exhaust gas return instruction in response to the temperature suitability signal and according to the exhaust gas return flow rate and the target exhaust gas return point, and send the instruction to the exhaust gas return module.

3. A rotary kiln circulating oxygen control system according to claim 2, characterized in that: The preset oxygen content includes a first preset oxygen content of the kiln head (11), a second preset oxygen content of the kiln body (12), and a third preset oxygen content of the kiln tail (13); and the current oxygen content deviation includes a first oxygen content deviation of the kiln head (11), a second oxygen content deviation of the kiln body (12), and a third oxygen content deviation of the kiln tail (13).

4. A rotary kiln circulating oxygen control system according to claim 3, characterized in that: The exhaust gas return module includes a multi-point gas guide network and a return regulation unit; The multi-point gas guide network comprises gas guide pipes (2) respectively arranged at the exhaust gas return points and connected to the exhaust gas outlet of the kiln tail (13), and used for responding to the exhaust gas return instruction and returning the exhaust gas to the kiln head (11) or the kiln body (12) according to the target exhaust gas return point; The return regulating unit is arranged on the air duct (2) and is used to regulate the exhaust gas return flow rate of the air duct (2) in response to the exhaust gas return instruction.

5. A rotary kiln circulating oxygen control system according to claim 3, characterized in that: The data processing unit is further used to calculate the air supply adjustment amount according to the current oxygen content deviation, and the control unit is further used to generate an air supply adjustment instruction according to the air supply adjustment amount and send it to the air supply module.

6. A rotary kiln circulating oxygen control system according to claim 5, characterized in that: The air supply module includes an air supply conveying device and a proportional regulating valve; The air supply and delivery device is connected to the air inlet of the kiln head (11) and is used to respond to the air supply adjustment instruction and adjust the combustion-supporting air and natural gas delivered to the rotary kiln according to the air supply adjustment amount; The ratio regulating valve is arranged on the gas supply and delivery device and is used to adjust the supply ratio of combustion-supporting air and natural gas.

7. A rotary kiln circulation oxygen control method, applied to a rotary kiln body including a kiln head, a kiln body and a kiln tail, characterized in that: The cyclic oxygen control method comprises: Real-time monitoring of the oxygen content in the kiln head or the kiln body to generate kiln monitoring data; Real-time monitoring of the tail gas temperature and tail gas oxygen content at the tail gas outlet of the kiln tail to generate tail gas monitoring data; Generate an exhaust gas return instruction according to the kiln monitoring data and the exhaust gas monitoring data; According to the tail gas return instruction, the tail gas at the tail gas outlet is returned to the kiln head or the kiln body.

8. A rotary kiln circulation oxygen control method according to claim 7, characterized in that: The step of generating an exhaust gas return instruction according to the kiln monitoring data and the exhaust gas monitoring data comprises: Analyzing the monitoring data in the kiln, and calculating the current oxygen content deviation of the kiln head or the kiln body based on the preset oxygen content; Determine the tail gas return flow rate and target tail gas return point according to the current oxygen content deviation of the kiln head or the kiln body; wherein the tail gas return point is respectively arranged on the kiln head or the kiln body; Determining whether the exhaust gas temperature exceeds a preset temperature threshold; If so, a tail gas return instruction is generated according to the tail gas return flow rate and the target tail gas return point; wherein the tail gas return instruction is used to return the tail gas to the kiln head or kiln body according to the target tail gas return point.

9. A rotary kiln circulation oxygen control method according to claim 8, characterized in that: After the step of respectively calculating the current oxygen content deviation of the kiln head or the kiln body based on the preset oxygen content, the step further includes: Calculating the air supply adjustment amount according to the current oxygen content deviation; A gas supply regulating instruction is generated according to the gas supply regulating amount, and the gas supply regulating instruction is used to regulate the combustion-supporting air and natural gas delivered to the rotary kiln according to the gas supply regulating amount.

10. A computer-readable storage medium, characterized in that: A computer program is stored which can be loaded by a processor and execute the method according to any one of claims 7 to 9.

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